Electrical condenser.



J, W. AYLSWGRTEQ ELEGTPJIGAL CONDENSER.

APPLICATION FILED Nov. a, 1913.

191 1 19593890 Patented Sept. 22, 191%.

UNITED STATES PATENT OFFICE.

JONAS W. AYLSWORTH, 01: EAST ORANGE, NEW

JERSEY, ASSIGNOR 'lO HALOGEN PRODUCTS COMPANY, OF GLEN RIDGE, NEW JERSEY, A CORPORATION OF NEW JERSEY.

ELECTRICAL CONDENSER.

Specification of Letters Patent.

Patented Sept. 22, 1912..

Application filed November 8, 1918. Serial No. 799,982.

To all whom it may concern:

Be it known that I, J onas W. Answoarn, a citizen of the United States, and a resident of East Orange, in the county of Essex, State of New Jersey, have invented certain new and useful Improvements in Electrical Condensers, of which the following is a description.

My invention relates to electrical condensers, and my object is to provide improved electrical condensers in which the insulating material used to separate the conducting strips or portions is formed of, or comprises, a composition which I have discovered to be particularly well adapted for the purpose. The said composition, com- Drising one of a group of substances to be hereinafter described, or a mixture of two or more of the same, when used in the manner indicated, possesses the desirable properties of high specific inductive capacity, high dielectric strength, and low conduct ance, as well as other useful properties, to a remarkable degree. The composition referred to may be briefly described as a halogen substitution. product of a carbo-cyclic hydro-carbon containing one or more closed chains.

Condensers made in accordance with my invention are of improved capacity, for given dimensions of dielectric, and improved reliability, so that they may be made smaller for a given capacity, and hence cheaper, while at the same time condensers of large size and area of dielectric may readily be made by my invention.

' My object is accordingly to provide condensers of the desirable properties and Wide much increased, while at the same time the other properties noted above of the improved condenser, of high dielectric strength, low conductance, etc., are so favorable, that the extended use of condensers in this and othernew fields is made possible. A substantlal economy and greater efficiency of condensers are also gained in their present field of usefulness, such as in connection with spark ignition circuits, telegraph and telephone circuits, electrical measuring instruments and the like. A condenser made in accordance with my inventlon comprises alternate layers of a conductor and an insulating separator, as is common, each alternate conductor being electrically connected to form one terminal and the. intermediate conductors being connected to form the other terminal. Within my invention, condensers may be constructed in any of the well-known forms, such as plate, cyllnder, disk, or coil condensers, and the conducting elements may be of any suitable or known material used for the purpose. My improvement is due, as stated, to the advantages of the novel insulating mater1al used by me between the conducting members of the condenser, the advantages referred to amounting to a substantially new and unexpected result. The insulation, of the class of bodies referred to, may be coated on the conductor members of the condenser before assembling the latter, or it may be impregnated in or coated on paper or other fabric, before construction of the condenser, and the insulators thus formed mounted in place; or the conductors may be separated by paper or otherv fabric and the partly completed condenser then impregnated with the insulating material in molten or fluid condition. I

In order that my invent-ion may be clearly understood attention is hereby directed to the accompanying drawing, forming part of this application, of my invention.

In the drawing, Figure 1 illustrates diagrammatically in cross section a plate condenser formed in accordance with my invention, and Fig. 2similarly illustrates a coil.

condenser.

In the drawings, the conducting memand illustrating one form beta, 1, 1, 1, are connected together and to one terminal 2, of the condenser, and the conducting members 3. 3, 3, are connected together and to the other terminal 4, the conducting members or plates being separated by sheets or coatings 5 of insulation of the character referred to.

I have found that the solid halogen substitution products of the carbo-cyclic hydrocarbons, containing one or more closed chains, as a class possess high specific inductive ca acity, an high dielectric stren h, while t eir conductance is very low and t eir melting points may be selected or manipulated by mixing two or more of these substances together, to suit desired requirements. Bodies in this class which I have found to be suitable for the desired purpose, either alone or in admixture with each other,

. are the following :-The solid halogen substitution products of benzene, the toluenes, naphthalenes, and anthracene, and the solid oxidation products of the above bodies. In

accordance with my invention any of the above may be used,v or other bodies of the general class referred to having equivalent properties. It is, further, not essential that the insulation be composed of one of the definite pure substances named above. Mixtures of the various isometric modifications of these bodies, as well as various stages of intermediate halogen substitution, are effective. The physical state of these bodies may also be altered by additions of small percentages of other bodies, such as resins and resinous ms misciblefherewith, for the urpose o alterin melting points, and renering' the bodies ess crystalline.

Iprefer to use the halogen substitution products referred to after they have been purified by distillation, which decomposes and se arates the loosely-attached or addition h ogen compounds from the true and stable substitution products.

Of the above-named substances I prefer, in most instances, to use the halo en substitution products of naphthalene, ecause of the smaller cost of these bodies, and their excellent properties for the desired purpose. Suitable examples are the tri-,- tetraor hexa-chloro-naphthalenes, or mixtures of the same, all of I which are solid substitution products. I

In selecting the body or bodies to be used in my invention, from the members of the,

general class referred to, due consideration must be paid to the physical. properties of the compound in reference to the construction and uses of a desired condenser. obvious that bodies having a very low melting point cannot well be used when the temperature becomes elevated, .and that bodies which have very high melting points cannot readily be a plied without the admixture of some su stance miscible therewith preferabl This formation 0 I pairs the dielectric strength of the roduct.

t isand adapted to lower its melting point. The best substance or compound for a given installation may be determined, from amen those described by me, by test and a consi eration of the above factors.

The specific inductive capacit of the halogen substitution products and mixtures described above as comprised within my invention, when utilized as the dielectric element in a condenser, varies from 100 r cent. to over 300 per cent. of that of para under parallel conditions of test. The other desirable properties for a condenser dielectric referred to above are also possessed by the com ounds described to a marked degree. T e conductance of these substances,

or example, is very low ranging from 31:10 to less than 1x10 reciprocal ohms per centimeter cube.

It will be understood that in the claims, the terms halogen substitution product and halogen-containing compound of one of the bodies referred to above are intended genericaiy to include the uinones or oxidation pr ucts of the sai substitution or halogen-containing products and also mixtures and isomeric modifications of the same, and that when the term solid oxygen compound of a halogen substitution product of one of the bodies referred to, or the like, appears in the claims, the same Is intended as a specific referred form of such substitution pro ucts. Some of these oxygen compounds have specific inductive capacities exceeding 500 per cent. of that of paraflin.

The halogen substitution products referred to are referably distilled, as stated, and if an oxi ation product of one of these bodies is used, the substitution product is distilled before being oxidized. The disti led solid chloro-naphthalenes and other substitution products referred to are characterized by com lete stability, because of the elimination 0 addition compounds, by the high heat of distilling the product, either alone or in the presence of a small gercentage of a basic oxid, such as lime.

istillation products made as indicated are absolutely stable when heated to temperatures equal to or lower than their boiling points, whereas halogen substitution roducts not distilled contain some ad ition products as' well, which continuously cause the evolution of hydrochloric acid, when the substance is heated to a suilicient tempera ture, of, for exam le, 300 F. and higher.

hydrochloric acid im- The oxidization compounds of so id chloro-naphthalenes and similar bodies are described in my application. Insulating compounds, Serial No. 641,326, filed J y 29, 1911. The oxidation products are generally more flexible than the products whichhave not been treated by an oxidizing agent,

Specific inductive capacity at 25 C.

(inductivity) ...2.62 Dielectric strength 122 volts per mil the test piece being 142 mils thick. Melting point l80 to 190 F.

Specific inductive capacity "12.0 Dielectric strength 450 volts per mil on a test piece 78 mils thick. Melting point about ..180 F.

3. Tetra-chloro-naphthalene, similar to Example 1, distilled:

Specific inductive capacity .3.41 I. ic-strength 271 volts per mil on a test piece 187 mils thick Melting point 224 F'.

4. Hexa-chloro-naphthalene (distilled) Specific inductive capacity "3.49 Dielectric strength 128 volts per mil (test piece) 135 mils Melting point 2e0 F. Insulation resistance (reci meal of conductivity) ranging 9 10:10-14 and less ..Especially good.

" Paraffin when treated under parallel conditions with the above tests has a specific inv ductive capacity of 1.81, dielectric strength of 348 volts per mil on a thickness of 140 mils, and amelting point of 140 F.

I find that when ortho cresol resin is mixed insmall proportions with the materials described above, it increases the dielectric strength of the compound and renders the product less crystalllne than it would otherwise be withoutmaterially altering the specific inductive capacity of the body. The ortho cresol'resin to which I particularly refer, is that described in my application Serial No. 703,199, Cresolic varnish compositions, filed June 12, 1912. As there described, the cresol resin which is soluble in various hydrocarbon and varnish oils and molten waxes, is' preferably prepared by heating together 30 parts ortho cresol with from- 14 to 16 parts of a 40 per cent. solution of formaldehyde, the heating taking place in an autoclave to cause the desired reaction 270 F. Also a small amount of water up to 8 parts may be added if desired, to decrease the violence of the reaction.

For an example .of the properties of the compound including the ortho cresol resin,

.it may be stated that thesame material-as used in Example 3 given above, when mixed with 6 per cent. of ortho cresol resin gave Specific inductive capacity 3 00 Dielectric strength "359 volts per mil on a galstkpiece 129 mils Also the material used in Example 4 above with the addition of 6 per cent. ortho cresol resin gave peciflc inductive capacity 3 26 S Dielectric strength 320 volts per mil on a igstkpiece 146 mils.

Tests made in the various examples given were made at 25 C. The same specimens tested at 42 C. showed increases in specific inductive capacity ranging from 3 to 16 per cent., whereas paraflin under the same conditions of test showed a decrease of 4.6 per cent. It is obvious that some of the bodies described are more constant under temperature variations than paraffin and that'others of them have the property of marked improvement in capacity with increase of temperature which for some uses is desirable. It has further been observed that the dielectric strength is. but slightly afiected by rangesoftemperaturebetween 25 C. and,

conducting members separated by insulating members comprising a solid halogen substitution product of a carbo-cyclic hydrocarbon containing one or more closed chains, substantially as described.

2. As a new article of manufacture, an electrical condenser in which the dielectric employed comprises a solid halogen substitution product of a carbo-cyclic hydrocarbon containing one or more closed chains, substantially as described.

3. As a new article of manufacture, an electrical condenser comprising electricallyconducting members separated by insulating members comprising a solid halogen substitution product of naphthalene, substantially as described.

l. As a new article of manufacture, an electrical condenser comprising electricallyconducting members separated by insulating members comprising a solid. halogen substitution product of naphthalene, associated with ortho-cresol resin, substantially as de- 55 which takesplace at a temperature of about 1 scribed.

5. As a new'article' ofmanufacture,' an electrical condenser in which the dielectric em loyed comprises a solid halogen substitution product of'a carboc'yclic h drocarbon containing one or more closed c ains, compounded with a small percentage of a phenolic resin miscible therewith, substantially as described. I

6. *As a new article of manufacture, an electrical condenser in which the dielectric employed comprises a solid halogen substitution product of a carbo-cyclic h drocarbon containing one .or more cl 1 chains, compounded with a small percentage of a resinous compound, substantially as described. T

7. As a new article of manufacture, an electrical condenser in which'the dielectric em loyed comprises a solid halogen substitution product of an aromatic hydrocarbon,

substantially as described.

8. As a new article of manufacture, anv

electrical condenser "comprising, electricallymore cl conducting members separated y insulating -members comprising a fabric carr ing a "solid halo en substitution product 0 a carbo-cyclic gdrocarbon containing one or scribed.

9.- As a new article of manufacture, an

chains, a substantially as de- 1,111,aee

electrical condenser comp electricallyconducting members separa by insulatmg members comp a fabric a solid halogen substitution product 0 naphthalene, substantially as described.

10. As a new article of manufacture, an electrical condenser in which the dielectric. employed comprises, a solid stable halogencontaimng compound of a carbo-cyclic hydrocarbon containing one or more closed chains, substantially as described.

11. As a new article of manufacture, an electlricgl1 condenser in whlici the dielectric emp 0 comprises a so 0 compound of a halo n substituti oii groduct of naphthalene, su stantially as described.

12. As a new article.of manufacture, an electrical condenser in which the dielectric employed comprises a solid oxygen compound of a halogen substitution product of a carbo-cyclichydrocarbon containing one or more closed chains, substantially as de scribed.

This s ification signed and witnessed this 6th ay of November, 1913.

JONAS W. AYLSWOBTH.

Witnesses:

Fnnnnmcx Bacmusx, 1 -WILLIAM A. HARDY. 

